<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <el-table :data="RolesList" border stripe>
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bdbottom',i1===0?'bdtop':'','vcenter']"
              v-for="(item1,i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级权限和三级权限 -->
              <el-col :span="19">
                <el-row
                  :class="[i2===0?'':'bdtop','vcenter']"
                  v-for="(item2,i2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row,item2.id)"
                    >{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeRightById(scope.row,item3.id)"
                    >{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <el-table-column type="index"></el-table-column>
        <el-table-column prop="roleName" label="角色名称"></el-table-column>
        <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete">删除</el-button>
            <el-button type="warning" icon="el-icon-setting"
            @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
      <!-- 分配权限的对话框 -->
      <el-dialog
        title="分配权限"
        :visible.sync="setRightDialogVisible"
        width="50%"
        @close="setRightDialogClosed">
        <el-tree :data="rightsList" :props="treeProps"
         show-checkbox default-expand-all node-key="id"
         :default-checked-keys="defKeys" 
         ref="treeRef" >
        </el-tree>
        <span slot="footer" class="dialog-footer">
          <el-button @click="setRightDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
      </el-dialog>
    </el-card>
  </div>
</template>
                        
            
<script>
export default {
  data() {
    return {
      // 角色列表数据
      RolesList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 权限列表数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点id值数组
      defKeys: [],
      // 角色id
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('角色列表数据获取失败')
      }
      // this.$message.success('角色列表数据获取成功')
      this.RolesList = res.data
      console.log(this.RolesList)
    },
    // 根据对应角色id删除权限
    async removeRightById(Role, rightsId) {
      // 删除之前先询问是否确定删除，需要用到messageBox
      const confirmResult = await this.$confirm(
        '此操作将永久删除该权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      console.log(confirmResult)
      if (confirmResult !== 'confirm') {
        this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(
        `roles/${Role.id}/rights/${rightsId}`
      )
      if (res.meta.status !== 200) {
        this.$message.error('删除权限失败')
      }
      this.$message.success('删除权限成功')
      Role.children = res.data
    },
    // 点击分配权限按钮 展示分配权限的对话框
    async showSetRightDialog(role){
      // 展现对话框之前 要先获取所有的权限列表数据
      const { data: res } = await this.$http.get('rights/tree')
      if(res.meta.status !== 200){
        this.$message.error('权限数据获取失败')
      }
      // 把权限数据保存到data中
      this.rightsList = res.data
      // 把角色id保存到data中
      this.roleId = role.id
      console.log('quanxian:', this.rightsList)
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的Id,并保存到defKeys数组中
    getLeafKeys(node, arr){
      // 如果当前node节点不包含children属性,则是三级节点
      if(!node.children){
        return arr.push(node.id)
      }
      // 反之不是三级节点
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 点击确定，分配权限
    async allotRights(){
      const keys = [...this.$refs.treeRef.getCheckedKeys(),
                    ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if(res.meta.status !== 200){
        this.$message.error('分配权限失败')
      }
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed(){
      this.defKeys = []
    }
  }
}
      
      
</script>
<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
